Many developers may not aware that the java.util.Properties class comes with a storeToXML() method to convert existing properties data into a XML file.

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;

public class PropertiesXMLExample
{
    public static void main(String[] args) throws IOException
    {
    	Properties props = new Properties();
    	props.setProperty("email.support", "spamfilter@nospam.com");

    	//where to store?
    	OutputStream os = new FileOutputStream("c:/email-configuration.xml");

    	//store the properties detail into a pre-defined XML file
    	props.storeToXML(os, "Support Email","UTF-8");

    	System.out.println("Done");
    }
}

The above example will write the properties detail into a XML file “c:/email-configuration.xml“.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
	<properties>
		<comment>Support Email</comment>
		<entry key="email.support">donot-spam-me@nospam.com</entry>
	</properties>